Design of Broadband Microstrip Grid Array Antenna Based on Dielectric Filling.

Based on dielectric filling, a microstrip grid antenna with six grids is designed in this paper. The broadband characteristics are achieved by increasing the thickness of substrate. An N-type penetrating coaxial port is adopted to feed the antenna for realizing high power capacity. Firstly, the influence of the grid parameters variation on the reflection coefficient was analyzed through the simulation model. Then, the structure of the antenna was optimized. Secondly, a prototype of the antenna was fabricated according to the optimized results. The measured results of the fabricated antenna show that the impedance bandwidth of the designed microstrip grid antenna can reach (taking |S11| < -10 dB as the reference) 24.3% ranging from 2.22 GHz to 2.83 GHz. The power capacity of the antenna in the 2.5 GHz can reach 229 Watts according to the measured result of power capacity. Therefore, the designed antenna can be effectively applied in the field of high power irradiation test and high power interference performance test of electronic equipment. [ABSTRACT FROM AUTHOR]